To pay your reservation, you to the “My Trips” section, then to “My accepted trips”. That’s where you can access your reservation and click on “Reserve and Pay”. Just enter your payment informations and you’re done !
Once the payment has been confirmed, you will receive a code that you need to keep until you arrive at your host’s place. Once you’ve dropped your bags, don’t forget to give your host the code so they can request their payment.